Designed for a precise and tight fit into the upper, Sons of Libertys M76 Handguard uses a proprietary wedge lock system. This system keeps the handguard tight against the barrel nut and upper receiver. Features a full length picatinny top rail, MLOK on the 3, 6, and 9 O'Clock positions, and a QD Socket. Black Hard Coat Anodized Finish to withstand the elements.